Summary: the scene. On others they are used to hold the suit symbols. Still others use them as backgrounds. The card number also appears in these circles. The art is good. The backs are reversible. The Major Arcana have astrological symbols in the circle. I think they are grouped in meaningful ways, but can not verify this as I can not read the Japanese language books. Some cards have
Image Dimensions: 646 x 682
Image originally found here.